Ed

Ed Leighton-Dick is a SQL Server performance and architecture expert and Founder/Principal Consultant of Kingfisher Technologies, a consultancy focused on SQL Server performance, architecture, and security. He is a frequent volunteer with PASS, including roles as regional mentor, chapter leader of I-380 PASS SQL Server User Group, and organizer of SQL Saturday Iowa City. He can often be found teaching sessions at local, regional, and national events, including user groups, SQL Saturday events, and Iowa Code Camp. Ed can be reached through his blog, edleightondick.com, and on Twitter at @eleightondick.

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Blog Post

Giving back [T-SQL Tuesday #102]

This post is part of the May 2018 T-SQL Tuesday blog challenge, “Giving Back“, from Riley Major. It’s been quite a while since I’ve participated in a T-SQL Tuesday....

2018-05-08

21 reads

Blog Post

Giving back [T-SQL Tuesday #102]

This post is part of the May 2018 T-SQL Tuesday blog challenge, “Giving Back“, from Riley Major. It’s been quite a while since I’ve participated in a T-SQL Tuesday....

2018-05-08

15 reads

Blog Post

Giving back [T-SQL Tuesday #102]

This post is part of the May 2018 T-SQL Tuesday blog challenge, “Giving Back“, from Riley Major. It’s been quite a while since I’ve participated in a T-SQL Tuesday....

2018-05-08

8 reads

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Question of the Day

Adding new column with DEFAULT II

Which number did the two COUNT(*) return: 

DROP TABLE IF EXISTS #tmp
CREATE TABLE #tmp (id INT NOT NULL)

INSERT INTO #tmp (id) 
SELECT gs.value
  FROM GENERATE_SERIES(1, 5) AS gs

ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value

ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

See possible answers